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Old 01-17-2012, 04:20 PM   #1
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Question CB Antenna Tune question

REF: Ultramount CB Antenna mount w/4' Firestick.

Did the tuning yesterday! SWR on Chan #1 was 1.5 and Chan 40 checked 0.5

This would seem to indicate that the antenna is a bit short? How would I lengthen the antenna, OR is this close enough?

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Old 01-17-2012, 04:56 PM   #2
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Put a spring between the antenna and the mount, but that will lengthen it too much.

Actually SWR of 1.5 and down is fine.

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Old 01-17-2012, 05:12 PM   #3
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Quote:
Originally Posted by sparky
Put a spring between the antenna and the mount, but that will lengthen it too much.

Actually SWR of 1.5 and down is fine.
X2 that SWR is just fine
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Old 01-17-2012, 05:29 PM   #4
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If it is a Firestick II. The red cap comes off and there is a screw type tip to lengthen or shorten it. You could adjust it some but .5-1.5 range is pretty good unless you are running extra power.
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Old 01-17-2012, 06:06 PM   #5
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Unless you have the model with the movable bolt on top, I think the only way to adjust is to trim the wire. Your SWR is great. Stop there.
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Old 01-18-2012, 04:01 PM   #6
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Talking Well...........

...........thanks folks If .5 and 1.5 are good, I'll leave her alone

If it ain't broke, don't fix it

Thanks so much for your time and help!
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Old 01-18-2012, 05:18 PM   #7
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Granted it has been about 20 years since I studied Antenna theory but I don't believe it is possible to obtain a SWR of less than 1:1 and even obtaining 1:1 is very difficult/almost impossible outside of a lab setting.

What kind of a meter are you using that indicates a ratio of .5?
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Old 01-19-2012, 04:44 AM   #8
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^ this is correct. The R in SWR stands for ratio. Ratio of power out to power returned. 1:1 means all power leaving the transmitter goes out the antenna. That's the best you can do.
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Old 01-19-2012, 05:07 PM   #9
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Talking It's a.........

Quote:
Originally Posted by the rock99 View Post
Granted it has been about 20 years since I studied Antenna theory but I don't believe it is possible to obtain a SWR of less than 1:1 and even obtaining 1:1 is very difficult/almost impossible outside of a lab setting.

What kind of a meter are you using that indicates a ratio of .5?
-----------------------------------------
Workman SWR-Meter SWR-2T
Now as per usual you folks here on WF have taught me a valuabe lesson: "Attention to detail"

The lowest reading on the scale is "1". That means the readings on the lowest & hightest channel is: 1.2 and 1.5, which is ideal and I am OK PTL

Thanks for the time and help!

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